Finding the Fourth Proportional to 1,178,892.72, 1,626,871.97 and 642,348.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,178,892.72 : 1,626,871.97 = 642,348.72 : x
2. Step 2: Convert to fraction form
   1,178,892.72/1,626,871.97 = 642,348.72/x
3. Step 3: Cross multiply
   1,178,892.72x = 1,626,871.97 × 642,348.72
4. Step 4: Simplify right side
   1,178,892.72x = 1,045,019,127,533.38
5. Step 5: Solve for x
   x = 1,045,019,127,533.38/1,178,892.72
6. Step 6: Final answer
   x = 886,441.24