Finding the Fourth Proportional to 12,061.60, 18,089.70 and 7,930.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,061.60 : 18,089.70 = 7,930.60 : x
2. Step 2: Convert to fraction form
   12,061.60/18,089.70 = 7,930.60/x
3. Step 3: Cross multiply
   12,061.60x = 18,089.70 × 7,930.60
4. Step 4: Simplify right side
   12,061.60x = 143,462,174.82
5. Step 5: Solve for x
   x = 143,462,174.82/12,061.60
6. Step 6: Final answer
   x = 11,894.12