Finding the Fourth Proportional to 12,986,440.68, 17,921,051.94 and 7,185,222.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,986,440.68 : 17,921,051.94 = 7,185,222.42 : x
2. Step 2: Convert to fraction form
   12,986,440.68/17,921,051.94 = 7,185,222.42/x
3. Step 3: Cross multiply
   12,986,440.68x = 17,921,051.94 × 7,185,222.42
4. Step 4: Simplify right side
   12,986,440.68x = 128,766,744,189,272.50
5. Step 5: Solve for x
   x = 128,766,744,189,272.50/12,986,440.68
6. Step 6: Final answer
   x = 9,915,476.25