Finding the Fourth Proportional to 9,521.60, 14,287.52 and 3,978.74

Step by Step Solution

1. Step 1: Write the proportion equation
   9,521.60 : 14,287.52 = 3,978.74 : x
2. Step 2: Convert to fraction form
   9,521.60/14,287.52 = 3,978.74/x
3. Step 3: Cross multiply
   9,521.60x = 14,287.52 × 3,978.74
4. Step 4: Simplify right side
   9,521.60x = 56,846,372.99
5. Step 5: Solve for x
   x = 56,846,372.99/9,521.60
6. Step 6: Final answer
   x = 5,970.26