Finding the Fourth Proportional to 212,978.18, 293,909.91 and 117,485.12

Step by Step Solution

1. Step 1: Write the proportion equation
   212,978.18 : 293,909.91 = 117,485.12 : x
2. Step 2: Convert to fraction form
   212,978.18/293,909.91 = 117,485.12/x
3. Step 3: Cross multiply
   212,978.18x = 293,909.91 × 117,485.12
4. Step 4: Simplify right side
   212,978.18x = 34,530,041,045.54
5. Step 5: Solve for x
   x = 34,530,041,045.54/212,978.18
6. Step 6: Final answer
   x = 162,129.48