Finding the Fourth Proportional to 12,706.45, 19,061.70 and 5,307.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,706.45 : 19,061.70 = 5,307.10 : x
2. Step 2: Convert to fraction form
   12,706.45/19,061.70 = 5,307.10/x
3. Step 3: Cross multiply
   12,706.45x = 19,061.70 × 5,307.10
4. Step 4: Simplify right side
   12,706.45x = 101,162,348.07
5. Step 5: Solve for x
   x = 101,162,348.07/12,706.45
6. Step 6: Final answer
   x = 7,961.50