Finding the Fourth Proportional to 19,920.55, 29,899.29 and 10,066.77

Step by Step Solution

1. Step 1: Write the proportion equation
   19,920.55 : 29,899.29 = 10,066.77 : x
2. Step 2: Convert to fraction form
   19,920.55/29,899.29 = 10,066.77/x
3. Step 3: Cross multiply
   19,920.55x = 29,899.29 × 10,066.77
4. Step 4: Simplify right side
   19,920.55x = 300,989,275.59
5. Step 5: Solve for x
   x = 300,989,275.59/19,920.55
6. Step 6: Final answer
   x = 15,109.49