Finding the Fourth Proportional to 7,899.10, 10,902.46 and 5,387.20

Step by Step Solution

1. Step 1: Write the proportion equation
   7,899.10 : 10,902.46 = 5,387.20 : x
2. Step 2: Convert to fraction form
   7,899.10/10,902.46 = 5,387.20/x
3. Step 3: Cross multiply
   7,899.10x = 10,902.46 × 5,387.20
4. Step 4: Simplify right side
   7,899.10x = 58,733,732.51
5. Step 5: Solve for x
   x = 58,733,732.51/7,899.10
6. Step 6: Final answer
   x = 7,435.50