Finding the Fourth Proportional to 142,637.31, 213,943.17 and 42,819.78

Step by Step Solution

1. Step 1: Write the proportion equation
   142,637.31 : 213,943.17 = 42,819.78 : x
2. Step 2: Convert to fraction form
   142,637.31/213,943.17 = 42,819.78/x
3. Step 3: Cross multiply
   142,637.31x = 213,943.17 × 42,819.78
4. Step 4: Simplify right side
   142,637.31x = 9,160,999,471.90
5. Step 5: Solve for x
   x = 9,160,999,471.90/142,637.31
6. Step 6: Final answer
   x = 64,225.83