Finding the Fourth Proportional to 56,981.86, 78,639.71 and 31,493.21

Step by Step Solution

1. Step 1: Write the proportion equation
   56,981.86 : 78,639.71 = 31,493.21 : x
2. Step 2: Convert to fraction form
   56,981.86/78,639.71 = 31,493.21/x
3. Step 3: Cross multiply
   56,981.86x = 78,639.71 × 31,493.21
4. Step 4: Simplify right side
   56,981.86x = 2,476,616,350.70
5. Step 5: Solve for x
   x = 2,476,616,350.70/56,981.86
6. Step 6: Final answer
   x = 43,463.24