Finding the Fourth Proportional to 9,989.53, 13,784.81 and 5,740.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,989.53 : 13,784.81 = 5,740.60 : x
2. Step 2: Convert to fraction form
   9,989.53/13,784.81 = 5,740.60/x
3. Step 3: Cross multiply
   9,989.53x = 13,784.81 × 5,740.60
4. Step 4: Simplify right side
   9,989.53x = 79,133,060.18
5. Step 5: Solve for x
   x = 79,133,060.18/9,989.53
6. Step 6: Final answer
   x = 7,921.60