Finding the Fourth Proportional to 56,839.50, 78,438.51 and 31,689

Step by Step Solution

1. Step 1: Write the proportion equation
   56,839.50 : 78,438.51 = 31,689 : x
2. Step 2: Convert to fraction form
   56,839.50/78,438.51 = 31,689/x
3. Step 3: Cross multiply
   56,839.50x = 78,438.51 × 31,689
4. Step 4: Simplify right side
   56,839.50x = 2,485,637,943.39
5. Step 5: Solve for x
   x = 2,485,637,943.39/56,839.50
6. Step 6: Final answer
   x = 43,730.82