Finding the Fourth Proportional to 1,123.84, 1,551.69 and 788.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.84 : 1,551.69 = 788.45 : x
2. Step 2: Convert to fraction form
   1,123.84/1,551.69 = 788.45/x
3. Step 3: Cross multiply
   1,123.84x = 1,551.69 × 788.45
4. Step 4: Simplify right side
   1,123.84x = 1,223,426.04
5. Step 5: Solve for x
   x = 1,223,426.04/1,123.84
6. Step 6: Final answer
   x = 1,088.62