Finding the Fourth Proportional to 1,377.57, 1,901.16 and 788.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.57 : 1,901.16 = 788.15 : x
2. Step 2: Convert to fraction form
   1,377.57/1,901.16 = 788.15/x
3. Step 3: Cross multiply
   1,377.57x = 1,901.16 × 788.15
4. Step 4: Simplify right side
   1,377.57x = 1,498,385.81
5. Step 5: Solve for x
   x = 1,498,385.81/1,377.57
6. Step 6: Final answer
   x = 1,087.70