Finding the Fourth Proportional to 12,156,799.70, 18,235,199.55 and 7,105,510.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,156,799.70 : 18,235,199.55 = 7,105,510.10 : x
2. Step 2: Convert to fraction form
   12,156,799.70/18,235,199.55 = 7,105,510.10/x
3. Step 3: Cross multiply
   12,156,799.70x = 18,235,199.55 × 7,105,510.10
4. Step 4: Simplify right side
   12,156,799.70x = 129,570,394,578,040.45
5. Step 5: Solve for x
   x = 129,570,394,578,040.45/12,156,799.70
6. Step 6: Final answer
   x = 10,658,265.15