Finding the Fourth Proportional to 13,280.04, 19,915.20 and 3,917.66

Step by Step Solution

1. Step 1: Write the proportion equation
   13,280.04 : 19,915.20 = 3,917.66 : x
2. Step 2: Convert to fraction form
   13,280.04/19,915.20 = 3,917.66/x
3. Step 3: Cross multiply
   13,280.04x = 19,915.20 × 3,917.66
4. Step 4: Simplify right side
   13,280.04x = 78,020,882.86
5. Step 5: Solve for x
   x = 78,020,882.86/13,280.04
6. Step 6: Final answer
   x = 5,875.05