Finding the Fourth Proportional to 318,978.78, 478,450.89 and 97,345.50

Step by Step Solution

1. Step 1: Write the proportion equation
   318,978.78 : 478,450.89 = 97,345.50 : x
2. Step 2: Convert to fraction form
   318,978.78/478,450.89 = 97,345.50/x
3. Step 3: Cross multiply
   318,978.78x = 478,450.89 × 97,345.50
4. Step 4: Simplify right side
   318,978.78x = 46,575,041,112.50
5. Step 5: Solve for x
   x = 46,575,041,112.50/318,978.78
6. Step 6: Final answer
   x = 146,012.98