Finding the Fourth Proportional to 312,264.50, 468,409.71 and 90,648.50

Step by Step Solution

1. Step 1: Write the proportion equation
   312,264.50 : 468,409.71 = 90,648.50 : x
2. Step 2: Convert to fraction form
   312,264.50/468,409.71 = 90,648.50/x
3. Step 3: Cross multiply
   312,264.50x = 468,409.71 × 90,648.50
4. Step 4: Simplify right side
   312,264.50x = 42,460,637,596.94
5. Step 5: Solve for x
   x = 42,460,637,596.94/312,264.50
6. Step 6: Final answer
   x = 135,976.51