Finding the Fourth Proportional to 9,118.86, 12,586.80 and 5,342.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,118.86 : 12,586.80 = 5,342.91 : x
2. Step 2: Convert to fraction form
   9,118.86/12,586.80 = 5,342.91/x
3. Step 3: Cross multiply
   9,118.86x = 12,586.80 × 5,342.91
4. Step 4: Simplify right side
   9,118.86x = 67,250,139.59
5. Step 5: Solve for x
   x = 67,250,139.59/9,118.86
6. Step 6: Final answer
   x = 7,374.84