Finding the Fourth Proportional to 1,538.91, 2,308.70 and 499.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,538.91 : 2,308.70 = 499.01 : x
2. Step 2: Convert to fraction form
   1,538.91/2,308.70 = 499.01/x
3. Step 3: Cross multiply
   1,538.91x = 2,308.70 × 499.01
4. Step 4: Simplify right side
   1,538.91x = 1,152,061.89
5. Step 5: Solve for x
   x = 1,152,061.89/1,538.91
6. Step 6: Final answer
   x = 748.62