Finding the Fourth Proportional to 1,222,128.16, 1,686,739.56 and 712,830.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222,128.16 : 1,686,739.56 = 712,830.52 : x
2. Step 2: Convert to fraction form
   1,222,128.16/1,686,739.56 = 712,830.52/x
3. Step 3: Cross multiply
   1,222,128.16x = 1,686,739.56 × 712,830.52
4. Step 4: Simplify right side
   1,222,128.16x = 1,202,359,437,659.37
5. Step 5: Solve for x
   x = 1,202,359,437,659.37/1,222,128.16
6. Step 6: Final answer
   x = 983,824.35