Finding the Fourth Proportional to 12,111,128.56, 18,146,128.20 and 7,308,726.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111,128.56 : 18,146,128.20 = 7,308,726.40 : x
2. Step 2: Convert to fraction form
   12,111,128.56/18,146,128.20 = 7,308,726.40/x
3. Step 3: Cross multiply
   12,111,128.56x = 18,146,128.20 × 7,308,726.40
4. Step 4: Simplify right side
   12,111,128.56x = 132,625,086,233,124.48
5. Step 5: Solve for x
   x = 132,625,086,233,124.48/12,111,128.56
6. Step 6: Final answer
   x = 10,950,679.42