Finding the Fourth Proportional to 2,172.86, 2,998.52 and 1,178.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.86 : 2,998.52 = 1,178.15 : x
2. Step 2: Convert to fraction form
   2,172.86/2,998.52 = 1,178.15/x
3. Step 3: Cross multiply
   2,172.86x = 2,998.52 × 1,178.15
4. Step 4: Simplify right side
   2,172.86x = 3,532,685.45
5. Step 5: Solve for x
   x = 3,532,685.45/2,172.86
6. Step 6: Final answer
   x = 1,625.83