Finding the Fourth Proportional to 2,978.65, 4,467.63 and 787.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.65 : 4,467.63 = 787.55 : x
2. Step 2: Convert to fraction form
   2,978.65/4,467.63 = 787.55/x
3. Step 3: Cross multiply
   2,978.65x = 4,467.63 × 787.55
4. Step 4: Simplify right side
   2,978.65x = 3,518,473.47
5. Step 5: Solve for x
   x = 3,518,473.47/2,978.65
6. Step 6: Final answer
   x = 1,181.23