Finding the Fourth Proportional to 12,856,242.78, 17,738,843.67 and 7,420,585.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,856,242.78 : 17,738,843.67 = 7,420,585.50 : x
2. Step 2: Convert to fraction form
   12,856,242.78/17,738,843.67 = 7,420,585.50/x
3. Step 3: Cross multiply
   12,856,242.78x = 17,738,843.67 × 7,420,585.50
4. Step 4: Simplify right side
   12,856,242.78x = 131,632,606,124,368.80
5. Step 5: Solve for x
   x = 131,632,606,124,368.80/12,856,242.78
6. Step 6: Final answer
   x = 10,238,808.37