Finding the Fourth Proportional to 56,359.50, 77,781.78 and 31,209

Step by Step Solution

1. Step 1: Write the proportion equation
   56,359.50 : 77,781.78 = 31,209 : x
2. Step 2: Convert to fraction form
   56,359.50/77,781.78 = 31,209/x
3. Step 3: Cross multiply
   56,359.50x = 77,781.78 × 31,209
4. Step 4: Simplify right side
   56,359.50x = 2,427,491,572.02
5. Step 5: Solve for x
   x = 2,427,491,572.02/56,359.50
6. Step 6: Final answer
   x = 43,071.56