Finding the Fourth Proportional to 328,978.10, 492,592.35 and 210,005.30

Step by Step Solution

1. Step 1: Write the proportion equation
   328,978.10 : 492,592.35 = 210,005.30 : x
2. Step 2: Convert to fraction form
   328,978.10/492,592.35 = 210,005.30/x
3. Step 3: Cross multiply
   328,978.10x = 492,592.35 × 210,005.30
4. Step 4: Simplify right side
   328,978.10x = 103,447,004,239.46
5. Step 5: Solve for x
   x = 103,447,004,239.46/328,978.10
6. Step 6: Final answer
   x = 314,449.52