Finding the Fourth Proportional to 12,039.90, 18,054.18 and 7,816.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,039.90 : 18,054.18 = 7,816.32 : x
2. Step 2: Convert to fraction form
   12,039.90/18,054.18 = 7,816.32/x
3. Step 3: Cross multiply
   12,039.90x = 18,054.18 × 7,816.32
4. Step 4: Simplify right side
   12,039.90x = 141,117,248.22
5. Step 5: Solve for x
   x = 141,117,248.22/12,039.90
6. Step 6: Final answer
   x = 11,720.80