Finding the Fourth Proportional to 2,245.86, 3,368.61 and 947.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,245.86 : 3,368.61 = 947.28 : x
2. Step 2: Convert to fraction form
   2,245.86/3,368.61 = 947.28/x
3. Step 3: Cross multiply
   2,245.86x = 3,368.61 × 947.28
4. Step 4: Simplify right side
   2,245.86x = 3,191,016.88
5. Step 5: Solve for x
   x = 3,191,016.88/2,245.86
6. Step 6: Final answer
   x = 1,420.84