Finding the Fourth Proportional to 1,377.76, 1,901.40 and 788.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.76 : 1,901.40 = 788.48 : x
2. Step 2: Convert to fraction form
   1,377.76/1,901.40 = 788.48/x
3. Step 3: Cross multiply
   1,377.76x = 1,901.40 × 788.48
4. Step 4: Simplify right side
   1,377.76x = 1,499,215.87
5. Step 5: Solve for x
   x = 1,499,215.87/1,377.76
6. Step 6: Final answer
   x = 1,088.15