Finding the Fourth Proportional to 56,633.20, 78,152.15 and 31,139.54

Step by Step Solution

1. Step 1: Write the proportion equation
   56,633.20 : 78,152.15 = 31,139.54 : x
2. Step 2: Convert to fraction form
   56,633.20/78,152.15 = 31,139.54/x
3. Step 3: Cross multiply
   56,633.20x = 78,152.15 × 31,139.54
4. Step 4: Simplify right side
   56,633.20x = 2,433,622,001.01
5. Step 5: Solve for x
   x = 2,433,622,001.01/56,633.20
6. Step 6: Final answer
   x = 42,971.65