Finding the Fourth Proportional to 13,065.90, 19,613.61 and 5,280.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,065.90 : 19,613.61 = 5,280.18 : x
2. Step 2: Convert to fraction form
   13,065.90/19,613.61 = 5,280.18/x
3. Step 3: Cross multiply
   13,065.90x = 19,613.61 × 5,280.18
4. Step 4: Simplify right side
   13,065.90x = 103,563,391.25
5. Step 5: Solve for x
   x = 103,563,391.25/13,065.90
6. Step 6: Final answer
   x = 7,926.23