Finding the Fourth Proportional to 2,178.55, 3,268.74 and 947.00

Step by Step Solution

1. Step 1: Write the proportion equation
   2,178.55 : 3,268.74 = 947.00 : x
2. Step 2: Convert to fraction form
   2,178.55/3,268.74 = 947.00/x
3. Step 3: Cross multiply
   2,178.55x = 3,268.74 × 947.00
4. Step 4: Simplify right side
   2,178.55x = 3,095,484.79
5. Step 5: Solve for x
   x = 3,095,484.79/2,178.55
6. Step 6: Final answer
   x = 1,420.89