Finding the Fourth Proportional to 278,468,899.72, 384,290,140.42 and 153,021,128.10

Step by Step Solution

1. Step 1: Write the proportion equation
   278,468,899.72 : 384,290,140.42 = 153,021,128.10 : x
2. Step 2: Convert to fraction form
   278,468,899.72/384,290,140.42 = 153,021,128.10/x
3. Step 3: Cross multiply
   278,468,899.72x = 384,290,140.42 × 153,021,128.10
4. Step 4: Simplify right side
   278,468,899.72x = 58,804,510,803,525,992
5. Step 5: Solve for x
   x = 58,804,510,803,525,992/278,468,899.72
6. Step 6: Final answer
   x = 211,170,837.62