Finding the Fourth Proportional to 1,390,552.56, 1,918,989.72 and 907,426.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390,552.56 : 1,918,989.72 = 907,426.80 : x
2. Step 2: Convert to fraction form
   1,390,552.56/1,918,989.72 = 907,426.80/x
3. Step 3: Cross multiply
   1,390,552.56x = 1,918,989.72 × 907,426.80
4. Step 4: Simplify right side
   1,390,552.56x = 1,741,342,700,852.50
5. Step 5: Solve for x
   x = 1,741,342,700,852.50/1,390,552.56
6. Step 6: Final answer
   x = 1,252,266.73