Finding the Fourth Proportional to 81,970.47, 123,039.95 and 42,516.99

Step by Step Solution

1. Step 1: Write the proportion equation
   81,970.47 : 123,039.95 = 42,516.99 : x
2. Step 2: Convert to fraction form
   81,970.47/123,039.95 = 42,516.99/x
3. Step 3: Cross multiply
   81,970.47x = 123,039.95 × 42,516.99
4. Step 4: Simplify right side
   81,970.47x = 5,231,288,111.17
5. Step 5: Solve for x
   x = 5,231,288,111.17/81,970.47
6. Step 6: Final answer
   x = 63,819.18