Finding the Fourth Proportional to 209,978.83, 314,968.48 and 52,207.30

Step by Step Solution

1. Step 1: Write the proportion equation
   209,978.83 : 314,968.48 = 52,207.30 : x
2. Step 2: Convert to fraction form
   209,978.83/314,968.48 = 52,207.30/x
3. Step 3: Cross multiply
   209,978.83x = 314,968.48 × 52,207.30
4. Step 4: Simplify right side
   209,978.83x = 16,443,653,007.96
5. Step 5: Solve for x
   x = 16,443,653,007.96/209,978.83
6. Step 6: Final answer
   x = 78,311.00