Finding the Fourth Proportional to 312,455, 468,762.42 and 90,839

Step by Step Solution

1. Step 1: Write the proportion equation
   312,455 : 468,762.42 = 90,839 : x
2. Step 2: Convert to fraction form
   312,455/468,762.42 = 90,839/x
3. Step 3: Cross multiply
   312,455x = 468,762.42 × 90,839
4. Step 4: Simplify right side
   312,455x = 42,581,909,470.38
5. Step 5: Solve for x
   x = 42,581,909,470.38/312,455
6. Step 6: Final answer
   x = 136,281.73