Finding the Fourth Proportional to 12,111,128.40, 18,146,127.60 and 7,308,726.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111,128.40 : 18,146,127.60 = 7,308,726.60 : x
2. Step 2: Convert to fraction form
   12,111,128.40/18,146,127.60 = 7,308,726.60/x
3. Step 3: Cross multiply
   12,111,128.40x = 18,146,127.60 × 7,308,726.60
4. Step 4: Simplify right side
   12,111,128.40x = 132,625,085,477,114.17
5. Step 5: Solve for x
   x = 132,625,085,477,114.17/12,111,128.40
6. Step 6: Final answer
   x = 10,950,679.50