Finding the Fourth Proportional to 5,436.01, 8,158.14 and 3,978.91

Step by Step Solution

1. Step 1: Write the proportion equation
   5,436.01 : 8,158.14 = 3,978.91 : x
2. Step 2: Convert to fraction form
   5,436.01/8,158.14 = 3,978.91/x
3. Step 3: Cross multiply
   5,436.01x = 8,158.14 × 3,978.91
4. Step 4: Simplify right side
   5,436.01x = 32,460,504.83
5. Step 5: Solve for x
   x = 32,460,504.83/5,436.01
6. Step 6: Final answer
   x = 5,971.38