Finding the Fourth Proportional to 6,429.08, 8,870.70 and 3,912.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,429.08 : 8,870.70 = 3,912.50 : x
2. Step 2: Convert to fraction form
   6,429.08/8,870.70 = 3,912.50/x
3. Step 3: Cross multiply
   6,429.08x = 8,870.70 × 3,912.50
4. Step 4: Simplify right side
   6,429.08x = 34,706,613.75
5. Step 5: Solve for x
   x = 34,706,613.75/6,429.08
6. Step 6: Final answer
   x = 5,398.38