Finding the Fourth Proportional to 420,978.71, 631,941.30 and 168,437.37

Step by Step Solution

1. Step 1: Write the proportion equation
   420,978.71 : 631,941.30 = 168,437.37 : x
2. Step 2: Convert to fraction form
   420,978.71/631,941.30 = 168,437.37/x
3. Step 3: Cross multiply
   420,978.71x = 631,941.30 × 168,437.37
4. Step 4: Simplify right side
   420,978.71x = 106,442,528,077.89
5. Step 5: Solve for x
   x = 106,442,528,077.89/420,978.71
6. Step 6: Final answer
   x = 252,845.39