Finding the Fourth Proportional to 1,651.50, 2,478.42 and 785.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,651.50 : 2,478.42 = 785.88 : x
2. Step 2: Convert to fraction form
   1,651.50/2,478.42 = 785.88/x
3. Step 3: Cross multiply
   1,651.50x = 2,478.42 × 785.88
4. Step 4: Simplify right side
   1,651.50x = 1,947,740.71
5. Step 5: Solve for x
   x = 1,947,740.71/1,651.50
6. Step 6: Final answer
   x = 1,179.38