Finding the Fourth Proportional to 1,878.86, 2,816.76 and 784.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,878.86 : 2,816.76 = 784.04 : x
2. Step 2: Convert to fraction form
   1,878.86/2,816.76 = 784.04/x
3. Step 3: Cross multiply
   1,878.86x = 2,816.76 × 784.04
4. Step 4: Simplify right side
   1,878.86x = 2,208,438.43
5. Step 5: Solve for x
   x = 2,208,438.43/1,878.86
6. Step 6: Final answer
   x = 1,175.42