Finding the Fourth Proportional to 12,456,142.51, 17,189,986.76 and 7,870,790.83

Step by Step Solution

1. Step 1: Write the proportion equation
   12,456,142.51 : 17,189,986.76 = 7,870,790.83 : x
2. Step 2: Convert to fraction form
   12,456,142.51/17,189,986.76 = 7,870,790.83/x
3. Step 3: Cross multiply
   12,456,142.51x = 17,189,986.76 × 7,870,790.83
4. Step 4: Simplify right side
   12,456,142.51x = 135,298,790,158,429.42
5. Step 5: Solve for x
   x = 135,298,790,158,429.42/12,456,142.51
6. Step 6: Final answer
   x = 10,862,013.67