Finding the Fourth Proportional to 31,088.84, 42,903.32 and 18,345.15

Step by Step Solution

1. Step 1: Write the proportion equation
   31,088.84 : 42,903.32 = 18,345.15 : x
2. Step 2: Convert to fraction form
   31,088.84/42,903.32 = 18,345.15/x
3. Step 3: Cross multiply
   31,088.84x = 42,903.32 × 18,345.15
4. Step 4: Simplify right side
   31,088.84x = 787,067,749.17
5. Step 5: Solve for x
   x = 787,067,749.17/31,088.84
6. Step 6: Final answer
   x = 25,316.73