Finding the Fourth Proportional to 42,712.31, 64,012.17 and 37,139.11

Step by Step Solution

1. Step 1: Write the proportion equation
   42,712.31 : 64,012.17 = 37,139.11 : x
2. Step 2: Convert to fraction form
   42,712.31/64,012.17 = 37,139.11/x
3. Step 3: Cross multiply
   42,712.31x = 64,012.17 × 37,139.11
4. Step 4: Simplify right side
   42,712.31x = 2,377,355,002.21
5. Step 5: Solve for x
   x = 2,377,355,002.21/42,712.31
6. Step 6: Final answer
   x = 55,659.71