Finding the Fourth Proportional to 1,417.60, 1,956.28 and 788.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,417.60 : 1,956.28 = 788.12 : x
2. Step 2: Convert to fraction form
   1,417.60/1,956.28 = 788.12/x
3. Step 3: Cross multiply
   1,417.60x = 1,956.28 × 788.12
4. Step 4: Simplify right side
   1,417.60x = 1,541,783.39
5. Step 5: Solve for x
   x = 1,541,783.39/1,417.60
6. Step 6: Final answer
   x = 1,087.60