Finding the Fourth Proportional to 1,777.73, 2,453.00 and 991.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,777.73 : 2,453.00 = 991.78 : x
2. Step 2: Convert to fraction form
   1,777.73/2,453.00 = 991.78/x
3. Step 3: Cross multiply
   1,777.73x = 2,453.00 × 991.78
4. Step 4: Simplify right side
   1,777.73x = 2,432,825.25
5. Step 5: Solve for x
   x = 2,432,825.25/1,777.73
6. Step 6: Final answer
   x = 1,368.50