Finding the Fourth Proportional to 1,378.02, 1,901.60 and 788.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.02 : 1,901.60 = 788.62 : x
2. Step 2: Convert to fraction form
   1,378.02/1,901.60 = 788.62/x
3. Step 3: Cross multiply
   1,378.02x = 1,901.60 × 788.62
4. Step 4: Simplify right side
   1,378.02x = 1,499,639.79
5. Step 5: Solve for x
   x = 1,499,639.79/1,378.02
6. Step 6: Final answer
   x = 1,088.26