Finding the Fourth Proportional to 1,377.86, 1,901.48 and 788.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.86 : 1,901.48 = 788.58 : x
2. Step 2: Convert to fraction form
   1,377.86/1,901.48 = 788.58/x
3. Step 3: Cross multiply
   1,377.86x = 1,901.48 × 788.58
4. Step 4: Simplify right side
   1,377.86x = 1,499,471.07
5. Step 5: Solve for x
   x = 1,499,471.07/1,377.86
6. Step 6: Final answer
   x = 1,088.26