Finding the Fourth Proportional to 56,280.12, 77,663.52 and 31,128

Step by Step Solution

1. Step 1: Write the proportion equation
   56,280.12 : 77,663.52 = 31,128 : x
2. Step 2: Convert to fraction form
   56,280.12/77,663.52 = 31,128/x
3. Step 3: Cross multiply
   56,280.12x = 77,663.52 × 31,128
4. Step 4: Simplify right side
   56,280.12x = 2,417,510,050.56
5. Step 5: Solve for x
   x = 2,417,510,050.56/56,280.12
6. Step 6: Final answer
   x = 42,954.96