Finding the Fourth Proportional to 7,870.70, 10,858.86 and 4,842.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,870.70 : 10,858.86 = 4,842.72 : x
2. Step 2: Convert to fraction form
   7,870.70/10,858.86 = 4,842.72/x
3. Step 3: Cross multiply
   7,870.70x = 10,858.86 × 4,842.72
4. Step 4: Simplify right side
   7,870.70x = 52,586,418.50
5. Step 5: Solve for x
   x = 52,586,418.50/7,870.70
6. Step 6: Final answer
   x = 6,681.29