Finding the Fourth Proportional to 56,603.72, 78,113.85 and 31,112.87

Step by Step Solution

1. Step 1: Write the proportion equation
   56,603.72 : 78,113.85 = 31,112.87 : x
2. Step 2: Convert to fraction form
   56,603.72/78,113.85 = 31,112.87/x
3. Step 3: Cross multiply
   56,603.72x = 78,113.85 × 31,112.87
4. Step 4: Simplify right side
   56,603.72x = 2,430,346,060.25
5. Step 5: Solve for x
   x = 2,430,346,060.25/56,603.72
6. Step 6: Final answer
   x = 42,936.15