Finding the Fourth Proportional to 31,133.76, 42,970.24 and 18,386.24

Step by Step Solution

1. Step 1: Write the proportion equation
   31,133.76 : 42,970.24 = 18,386.24 : x
2. Step 2: Convert to fraction form
   31,133.76/42,970.24 = 18,386.24/x
3. Step 3: Cross multiply
   31,133.76x = 42,970.24 × 18,386.24
4. Step 4: Simplify right side
   31,133.76x = 790,061,145.50
5. Step 5: Solve for x
   x = 790,061,145.50/31,133.76
6. Step 6: Final answer
   x = 25,376.35