Finding the Fourth Proportional to 13,143,772.98, 18,139,103.10 and 7,918,426.06

Step by Step Solution

1. Step 1: Write the proportion equation
   13,143,772.98 : 18,139,103.10 = 7,918,426.06 : x
2. Step 2: Convert to fraction form
   13,143,772.98/18,139,103.10 = 7,918,426.06/x
3. Step 3: Cross multiply
   13,143,772.98x = 18,139,103.10 × 7,918,426.06
4. Step 4: Simplify right side
   13,143,772.98x = 143,633,146,692,066.78
5. Step 5: Solve for x
   x = 143,633,146,692,066.78/13,143,772.98
6. Step 6: Final answer
   x = 10,927,847.50