Finding the Fourth Proportional to 646,978.78, 970,642.86 and 197,687.34

Step by Step Solution

1. Step 1: Write the proportion equation
   646,978.78 : 970,642.86 = 197,687.34 : x
2. Step 2: Convert to fraction form
   646,978.78/970,642.86 = 197,687.34/x
3. Step 3: Cross multiply
   646,978.78x = 970,642.86 × 197,687.34
4. Step 4: Simplify right side
   646,978.78x = 191,883,805,083.39
5. Step 5: Solve for x
   x = 191,883,805,083.39/646,978.78
6. Step 6: Final answer
   x = 296,584.39