Finding the Fourth Proportional to 1,259,441.92, 1,737,978.72 and 686,469.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,259,441.92 : 1,737,978.72 = 686,469.76 : x
2. Step 2: Convert to fraction form
   1,259,441.92/1,737,978.72 = 686,469.76/x
3. Step 3: Cross multiply
   1,259,441.92x = 1,737,978.72 × 686,469.76
4. Step 4: Simplify right side
   1,259,441.92x = 1,193,069,834,803.51
5. Step 5: Solve for x
   x = 1,193,069,834,803.51/1,259,441.92
6. Step 6: Final answer
   x = 947,300.40