Finding the Fourth Proportional to 12,940,471.98, 17,857,728.18 and 7,139,300.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,940,471.98 : 17,857,728.18 = 7,139,300.58 : x
2. Step 2: Convert to fraction form
   12,940,471.98/17,857,728.18 = 7,139,300.58/x
3. Step 3: Cross multiply
   12,940,471.98x = 17,857,728.18 × 7,139,300.58
4. Step 4: Simplify right side
   12,940,471.98x = 127,491,689,152,956.34
5. Step 5: Solve for x
   x = 127,491,689,152,956.34/12,940,471.98
6. Step 6: Final answer
   x = 9,852,166.86