Finding the Fourth Proportional to 10,385.34, 15,580.61 and 2,989.79

Step by Step Solution

1. Step 1: Write the proportion equation
   10,385.34 : 15,580.61 = 2,989.79 : x
2. Step 2: Convert to fraction form
   10,385.34/15,580.61 = 2,989.79/x
3. Step 3: Cross multiply
   10,385.34x = 15,580.61 × 2,989.79
4. Step 4: Simplify right side
   10,385.34x = 46,582,659.12
5. Step 5: Solve for x
   x = 46,582,659.12/10,385.34
6. Step 6: Final answer
   x = 4,485.42