Finding the Fourth Proportional to 12,870.90, 19,293.39 and 4,545.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.90 : 19,293.39 = 4,545.72 : x
2. Step 2: Convert to fraction form
   12,870.90/19,293.39 = 4,545.72/x
3. Step 3: Cross multiply
   12,870.90x = 19,293.39 × 4,545.72
4. Step 4: Simplify right side
   12,870.90x = 87,702,348.79
5. Step 5: Solve for x
   x = 87,702,348.79/12,870.90
6. Step 6: Final answer
   x = 6,814.00