Finding the Fourth Proportional to 1,223,267.50, 1,688,109.15 and 686,723.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,223,267.50 : 1,688,109.15 = 686,723.50 : x
2. Step 2: Convert to fraction form
   1,223,267.50/1,688,109.15 = 686,723.50/x
3. Step 3: Cross multiply
   1,223,267.50x = 1,688,109.15 × 686,723.50
4. Step 4: Simplify right side
   1,223,267.50x = 1,159,264,223,870.02
5. Step 5: Solve for x
   x = 1,159,264,223,870.02/1,223,267.50
6. Step 6: Final answer
   x = 947,678.43