Finding the Fourth Proportional to 12,307.77, 18,478.06 and 10,470.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,307.77 : 18,478.06 = 10,470.69 : x
2. Step 2: Convert to fraction form
   12,307.77/18,478.06 = 10,470.69/x
3. Step 3: Cross multiply
   12,307.77x = 18,478.06 × 10,470.69
4. Step 4: Simplify right side
   12,307.77x = 193,478,011.88
5. Step 5: Solve for x
   x = 193,478,011.88/12,307.77
6. Step 6: Final answer
   x = 15,719.99