Finding the Fourth Proportional to 21,561.50, 32,379.03 and 11,720.00

Step by Step Solution

1. Step 1: Write the proportion equation
   21,561.50 : 32,379.03 = 11,720.00 : x
2. Step 2: Convert to fraction form
   21,561.50/32,379.03 = 11,720.00/x
3. Step 3: Cross multiply
   21,561.50x = 32,379.03 × 11,720.00
4. Step 4: Simplify right side
   21,561.50x = 379,482,069.70
5. Step 5: Solve for x
   x = 379,482,069.70/21,561.50
6. Step 6: Final answer
   x = 17,599.99