Finding the Fourth Proportional to 31,146.89, 42,977.64 and 18,398.31

Step by Step Solution

1. Step 1: Write the proportion equation
   31,146.89 : 42,977.64 = 18,398.31 : x
2. Step 2: Convert to fraction form
   31,146.89/42,977.64 = 18,398.31/x
3. Step 3: Cross multiply
   31,146.89x = 42,977.64 × 18,398.31
4. Step 4: Simplify right side
   31,146.89x = 790,715,943.79
5. Step 5: Solve for x
   x = 790,715,943.79/31,146.89
6. Step 6: Final answer
   x = 25,386.67