Finding the Fourth Proportional to 970,667.32, 1,339,126.32 and 644,134.33

Step by Step Solution

1. Step 1: Write the proportion equation
   970,667.32 : 1,339,126.32 = 644,134.33 : x
2. Step 2: Convert to fraction form
   970,667.32/1,339,126.32 = 644,134.33/x
3. Step 3: Cross multiply
   970,667.32x = 1,339,126.32 × 644,134.33
4. Step 4: Simplify right side
   970,667.32x = 862,577,234,918.57
5. Step 5: Solve for x
   x = 862,577,234,918.57/970,667.32
6. Step 6: Final answer
   x = 888,643.53