Finding the Fourth Proportional to 31,376, 43,302.72 and 18,128

Step by Step Solution

1. Step 1: Write the proportion equation
   31,376 : 43,302.72 = 18,128 : x
2. Step 2: Convert to fraction form
   31,376/43,302.72 = 18,128/x
3. Step 3: Cross multiply
   31,376x = 43,302.72 × 18,128
4. Step 4: Simplify right side
   31,376x = 784,991,708.16
5. Step 5: Solve for x
   x = 784,991,708.16/31,376
6. Step 6: Final answer
   x = 25,018.86