Finding the Fourth Proportional to 1,777.50, 2,452.93 and 991.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,777.50 : 2,452.93 = 991.55 : x
2. Step 2: Convert to fraction form
   1,777.50/2,452.93 = 991.55/x
3. Step 3: Cross multiply
   1,777.50x = 2,452.93 × 991.55
4. Step 4: Simplify right side
   1,777.50x = 2,432,185.52
5. Step 5: Solve for x
   x = 2,432,185.52/1,777.50
6. Step 6: Final answer
   x = 1,368.32