Finding the Fourth Proportional to 56,633.84, 78,156.40 and 31,138.89

Step by Step Solution

1. Step 1: Write the proportion equation
   56,633.84 : 78,156.40 = 31,138.89 : x
2. Step 2: Convert to fraction form
   56,633.84/78,156.40 = 31,138.89/x
3. Step 3: Cross multiply
   56,633.84x = 78,156.40 × 31,138.89
4. Step 4: Simplify right side
   56,633.84x = 2,433,703,151.61
5. Step 5: Solve for x
   x = 2,433,703,151.61/56,633.84
6. Step 6: Final answer
   x = 42,972.60