Finding the Fourth Proportional to 52,308.70, 78,462.34 and 12,866.15

Step by Step Solution

1. Step 1: Write the proportion equation
   52,308.70 : 78,462.34 = 12,866.15 : x
2. Step 2: Convert to fraction form
   52,308.70/78,462.34 = 12,866.15/x
3. Step 3: Cross multiply
   52,308.70x = 78,462.34 × 12,866.15
4. Step 4: Simplify right side
   52,308.70x = 1,009,508,399.78
5. Step 5: Solve for x
   x = 1,009,508,399.78/52,308.70
6. Step 6: Final answer
   x = 19,299.05