Finding the Fourth Proportional to 311,728.50, 467,670.51 and 90,112.50

Step by Step Solution

1. Step 1: Write the proportion equation
   311,728.50 : 467,670.51 = 90,112.50 : x
2. Step 2: Convert to fraction form
   311,728.50/467,670.51 = 90,112.50/x
3. Step 3: Cross multiply
   311,728.50x = 467,670.51 × 90,112.50
4. Step 4: Simplify right side
   311,728.50x = 42,142,958,832.38
5. Step 5: Solve for x
   x = 42,142,958,832.38/311,728.50
6. Step 6: Final answer
   x = 135,191.23