Finding the Fourth Proportional to 142,128,000.10, 213,192,000.15 and 142,128,000.10

Step by Step Solution

1. Step 1: Write the proportion equation
   142,128,000.10 : 213,192,000.15 = 142,128,000.10 : x
2. Step 2: Convert to fraction form
   142,128,000.10/213,192,000.15 = 142,128,000.10/x
3. Step 3: Cross multiply
   142,128,000.10x = 213,192,000.15 × 142,128,000.10
4. Step 4: Simplify right side
   142,128,000.10x = 30,300,552,618,638,400
5. Step 5: Solve for x
   x = 30,300,552,618,638,400/142,128,000.10
6. Step 6: Final answer
   x = 213,192,000.15