Finding the Fourth Proportional to 1,426.87, 1,969.10 and 788.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.87 : 1,969.10 = 788.77 : x
2. Step 2: Convert to fraction form
   1,426.87/1,969.10 = 788.77/x
3. Step 3: Cross multiply
   1,426.87x = 1,969.10 × 788.77
4. Step 4: Simplify right side
   1,426.87x = 1,553,167.01
5. Step 5: Solve for x
   x = 1,553,167.01/1,426.87
6. Step 6: Final answer
   x = 1,088.51