Finding the Fourth Proportional to 8,535.87, 12,810.42 and 5,921.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,535.87 : 12,810.42 = 5,921.72 : x
2. Step 2: Convert to fraction form
   8,535.87/12,810.42 = 5,921.72/x
3. Step 3: Cross multiply
   8,535.87x = 12,810.42 × 5,921.72
4. Step 4: Simplify right side
   8,535.87x = 75,859,656.27
5. Step 5: Solve for x
   x = 75,859,656.27/8,535.87
6. Step 6: Final answer
   x = 8,887.17