Finding the Fourth Proportional to 56,891.76, 78,510.06 and 31,398.36

Step by Step Solution

1. Step 1: Write the proportion equation
   56,891.76 : 78,510.06 = 31,398.36 : x
2. Step 2: Convert to fraction form
   56,891.76/78,510.06 = 31,398.36/x
3. Step 3: Cross multiply
   56,891.76x = 78,510.06 × 31,398.36
4. Step 4: Simplify right side
   56,891.76x = 2,465,087,127.50
5. Step 5: Solve for x
   x = 2,465,087,127.50/56,891.76
6. Step 6: Final answer
   x = 43,329.42