Finding the Fourth Proportional to 8,739.60, 12,061.61 and 5,381.74

Step by Step Solution

1. Step 1: Write the proportion equation
   8,739.60 : 12,061.61 = 5,381.74 : x
2. Step 2: Convert to fraction form
   8,739.60/12,061.61 = 5,381.74/x
3. Step 3: Cross multiply
   8,739.60x = 12,061.61 × 5,381.74
4. Step 4: Simplify right side
   8,739.60x = 64,912,449.00
5. Step 5: Solve for x
   x = 64,912,449.00/8,739.60
6. Step 6: Final answer
   x = 7,427.39