Finding the Fourth Proportional to 56,131.38, 77,461.20 and 30,980.88

Step by Step Solution

1. Step 1: Write the proportion equation
   56,131.38 : 77,461.20 = 30,980.88 : x
2. Step 2: Convert to fraction form
   56,131.38/77,461.20 = 30,980.88/x
3. Step 3: Cross multiply
   56,131.38x = 77,461.20 × 30,980.88
4. Step 4: Simplify right side
   56,131.38x = 2,399,816,141.86
5. Step 5: Solve for x
   x = 2,399,816,141.86/56,131.38
6. Step 6: Final answer
   x = 42,753.56