Finding the Fourth Proportional to 19,665.52, 29,499.90 and 7,977.22

Step by Step Solution

1. Step 1: Write the proportion equation
   19,665.52 : 29,499.90 = 7,977.22 : x
2. Step 2: Convert to fraction form
   19,665.52/29,499.90 = 7,977.22/x
3. Step 3: Cross multiply
   19,665.52x = 29,499.90 × 7,977.22
4. Step 4: Simplify right side
   19,665.52x = 235,327,088.61
5. Step 5: Solve for x
   x = 235,327,088.61/19,665.52
6. Step 6: Final answer
   x = 11,966.48