Finding the Fourth Proportional to 1,777.83, 2,453.38 and 991.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,777.83 : 2,453.38 = 991.88 : x
2. Step 2: Convert to fraction form
   1,777.83/2,453.38 = 991.88/x
3. Step 3: Cross multiply
   1,777.83x = 2,453.38 × 991.88
4. Step 4: Simplify right side
   1,777.83x = 2,433,458.55
5. Step 5: Solve for x
   x = 2,433,458.55/1,777.83
6. Step 6: Final answer
   x = 1,368.78