Finding the Fourth Proportional to 1,642.51, 2,458.89 and 991.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,642.51 : 2,458.89 = 991.27 : x
2. Step 2: Convert to fraction form
   1,642.51/2,458.89 = 991.27/x
3. Step 3: Cross multiply
   1,642.51x = 2,458.89 × 991.27
4. Step 4: Simplify right side
   1,642.51x = 2,437,423.89
5. Step 5: Solve for x
   x = 2,437,423.89/1,642.51
6. Step 6: Final answer
   x = 1,483.96