Finding the Fourth Proportional to 1,138,238.18, 1,570,768.17 and 628,936.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,138,238.18 : 1,570,768.17 = 628,936.10 : x
2. Step 2: Convert to fraction form
   1,138,238.18/1,570,768.17 = 628,936.10/x
3. Step 3: Cross multiply
   1,138,238.18x = 1,570,768.17 × 628,936.10
4. Step 4: Simplify right side
   1,138,238.18x = 987,912,806,843.94
5. Step 5: Solve for x
   x = 987,912,806,843.94/1,138,238.18
6. Step 6: Final answer
   x = 867,931.53