Finding the Fourth Proportional to 12,090,404.80, 18,111,987.60 and 7,283,816.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,090,404.80 : 18,111,987.60 = 7,283,816.20 : x
2. Step 2: Convert to fraction form
   12,090,404.80/18,111,987.60 = 7,283,816.20/x
3. Step 3: Cross multiply
   12,090,404.80x = 18,111,987.60 × 7,283,816.20
4. Step 4: Simplify right side
   12,090,404.80x = 131,924,388,695,079.14
5. Step 5: Solve for x
   x = 131,924,388,695,079.14/12,090,404.80
6. Step 6: Final answer
   x = 10,911,494.77