Finding the Fourth Proportional to 56,385, 77,811.30 and 31,236.12

Step by Step Solution

1. Step 1: Write the proportion equation
   56,385 : 77,811.30 = 31,236.12 : x
2. Step 2: Convert to fraction form
   56,385/77,811.30 = 31,236.12/x
3. Step 3: Cross multiply
   56,385x = 77,811.30 × 31,236.12
4. Step 4: Simplify right side
   56,385x = 2,430,523,104.16
5. Step 5: Solve for x
   x = 2,430,523,104.16/56,385
6. Step 6: Final answer
   x = 43,105.85