Finding the Fourth Proportional to 9,012.42, 12,445.70 and 8,521.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,012.42 : 12,445.70 = 8,521.56 : x
2. Step 2: Convert to fraction form
   9,012.42/12,445.70 = 8,521.56/x
3. Step 3: Cross multiply
   9,012.42x = 12,445.70 × 8,521.56
4. Step 4: Simplify right side
   9,012.42x = 106,056,779.29
5. Step 5: Solve for x
   x = 106,056,779.29/9,012.42
6. Step 6: Final answer
   x = 11,767.85