Finding the Fourth Proportional to 142,145.30, 212,937.15 and 92,260.10

Step by Step Solution

1. Step 1: Write the proportion equation
   142,145.30 : 212,937.15 = 92,260.10 : x
2. Step 2: Convert to fraction form
   142,145.30/212,937.15 = 92,260.10/x
3. Step 3: Cross multiply
   142,145.30x = 212,937.15 × 92,260.10
4. Step 4: Simplify right side
   142,145.30x = 19,645,602,752.72
5. Step 5: Solve for x
   x = 19,645,602,752.72/142,145.30
6. Step 6: Final answer
   x = 138,207.90