Finding the Fourth Proportional to 28,671.18, 42,958.29 and 13,887.18

Step by Step Solution

1. Step 1: Write the proportion equation
   28,671.18 : 42,958.29 = 13,887.18 : x
2. Step 2: Convert to fraction form
   28,671.18/42,958.29 = 13,887.18/x
3. Step 3: Cross multiply
   28,671.18x = 42,958.29 × 13,887.18
4. Step 4: Simplify right side
   28,671.18x = 596,569,505.72
5. Step 5: Solve for x
   x = 596,569,505.72/28,671.18
6. Step 6: Final answer
   x = 20,807.29