Finding the Fourth Proportional to 31,088.96, 42,902.76 and 18,342.32

Step by Step Solution

1. Step 1: Write the proportion equation
   31,088.96 : 42,902.76 = 18,342.32 : x
2. Step 2: Convert to fraction form
   31,088.96/42,902.76 = 18,342.32/x
3. Step 3: Cross multiply
   31,088.96x = 42,902.76 × 18,342.32
4. Step 4: Simplify right side
   31,088.96x = 786,936,152.80
5. Step 5: Solve for x
   x = 786,936,152.80/31,088.96
6. Step 6: Final answer
   x = 25,312.40