Finding the Fourth Proportional to 1,377.98, 1,901.68 and 788.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.98 : 1,901.68 = 788.72 : x
2. Step 2: Convert to fraction form
   1,377.98/1,901.68 = 788.72/x
3. Step 3: Cross multiply
   1,377.98x = 1,901.68 × 788.72
4. Step 4: Simplify right side
   1,377.98x = 1,499,893.05
5. Step 5: Solve for x
   x = 1,499,893.05/1,377.98
6. Step 6: Final answer
   x = 1,088.47