Finding the Fourth Proportional to 558,978.56, 838,659.20 and 238,998.60

Step by Step Solution

1. Step 1: Write the proportion equation
   558,978.56 : 838,659.20 = 238,998.60 : x
2. Step 2: Convert to fraction form
   558,978.56/838,659.20 = 238,998.60/x
3. Step 3: Cross multiply
   558,978.56x = 838,659.20 × 238,998.60
4. Step 4: Simplify right side
   558,978.56x = 200,438,374,677.12
5. Step 5: Solve for x
   x = 200,438,374,677.12/558,978.56
6. Step 6: Final answer
   x = 358,579.72