Finding the Fourth Proportional to 1,777.86, 2,453.40 and 991.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,777.86 : 2,453.40 = 991.98 : x
2. Step 2: Convert to fraction form
   1,777.86/2,453.40 = 991.98/x
3. Step 3: Cross multiply
   1,777.86x = 2,453.40 × 991.98
4. Step 4: Simplify right side
   1,777.86x = 2,433,723.73
5. Step 5: Solve for x
   x = 2,433,723.73/1,777.86
6. Step 6: Final answer
   x = 1,368.91