Finding the Fourth Proportional to 5,250.72, 7,870.64 and 2,784.90

Step by Step Solution

1. Step 1: Write the proportion equation
   5,250.72 : 7,870.64 = 2,784.90 : x
2. Step 2: Convert to fraction form
   5,250.72/7,870.64 = 2,784.90/x
3. Step 3: Cross multiply
   5,250.72x = 7,870.64 × 2,784.90
4. Step 4: Simplify right side
   5,250.72x = 21,918,931.41
5. Step 5: Solve for x
   x = 21,918,931.41/5,250.72
6. Step 6: Final answer
   x = 4,174.46