Finding the Fourth Proportional to 12,142,872.61, 18,209,124.25 and 7,028,832.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,142,872.61 : 18,209,124.25 = 7,028,832.47 : x
2. Step 2: Convert to fraction form
   12,142,872.61/18,209,124.25 = 7,028,832.47/x
3. Step 3: Cross multiply
   12,142,872.61x = 18,209,124.25 × 7,028,832.47
4. Step 4: Simplify right side
   12,142,872.61x = 127,988,883,670,046.69
5. Step 5: Solve for x
   x = 127,988,883,670,046.69/12,142,872.61
6. Step 6: Final answer
   x = 10,540,247.58