Finding the Fourth Proportional to 1,351.40, 1,865.70 and 977.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,351.40 : 1,865.70 = 977.99 : x
2. Step 2: Convert to fraction form
   1,351.40/1,865.70 = 977.99/x
3. Step 3: Cross multiply
   1,351.40x = 1,865.70 × 977.99
4. Step 4: Simplify right side
   1,351.40x = 1,824,626.61
5. Step 5: Solve for x
   x = 1,824,626.61/1,351.40
6. Step 6: Final answer
   x = 1,350.18