Finding the Fourth Proportional to 13,088.50, 18,061.99 and 7,783.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,088.50 : 18,061.99 = 7,783.20 : x
2. Step 2: Convert to fraction form
   13,088.50/18,061.99 = 7,783.20/x
3. Step 3: Cross multiply
   13,088.50x = 18,061.99 × 7,783.20
4. Step 4: Simplify right side
   13,088.50x = 140,580,080.57
5. Step 5: Solve for x
   x = 140,580,080.57/13,088.50
6. Step 6: Final answer
   x = 10,740.73