Finding the Fourth Proportional to 2,156.42, 2,973.84 and 1,715.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.42 : 2,973.84 = 1,715.78 : x
2. Step 2: Convert to fraction form
   2,156.42/2,973.84 = 1,715.78/x
3. Step 3: Cross multiply
   2,156.42x = 2,973.84 × 1,715.78
4. Step 4: Simplify right side
   2,156.42x = 5,102,455.20
5. Step 5: Solve for x
   x = 5,102,455.20/2,156.42
6. Step 6: Final answer
   x = 2,366.17