Finding the Fourth Proportional to 15,899.10, 21,947.67 and 12,356.70

Step by Step Solution

1. Step 1: Write the proportion equation
   15,899.10 : 21,947.67 = 12,356.70 : x
2. Step 2: Convert to fraction form
   15,899.10/21,947.67 = 12,356.70/x
3. Step 3: Cross multiply
   15,899.10x = 21,947.67 × 12,356.70
4. Step 4: Simplify right side
   15,899.10x = 271,200,773.89
5. Step 5: Solve for x
   x = 271,200,773.89/15,899.10
6. Step 6: Final answer
   x = 17,057.62