Finding the Fourth Proportional to 12,913,131.92, 17,820,927.96 and 7,111,912.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,913,131.92 : 17,820,927.96 = 7,111,912.12 : x
2. Step 2: Convert to fraction form
   12,913,131.92/17,820,927.96 = 7,111,912.12/x
3. Step 3: Cross multiply
   12,913,131.92x = 17,820,927.96 × 7,111,912.12
4. Step 4: Simplify right side
   12,913,131.92x = 126,740,873,477,148.89
5. Step 5: Solve for x
   x = 126,740,873,477,148.89/12,913,131.92
6. Step 6: Final answer
   x = 9,814,882.58