Finding the Fourth Proportional to 5,091.80, 7,631.22 and 3,931.88

Step by Step Solution

1. Step 1: Write the proportion equation
   5,091.80 : 7,631.22 = 3,931.88 : x
2. Step 2: Convert to fraction form
   5,091.80/7,631.22 = 3,931.88/x
3. Step 3: Cross multiply
   5,091.80x = 7,631.22 × 3,931.88
4. Step 4: Simplify right side
   5,091.80x = 30,005,041.29
5. Step 5: Solve for x
   x = 30,005,041.29/5,091.80
6. Step 6: Final answer
   x = 5,892.82