Finding the Fourth Proportional to 312,300.50, 468,463.71 and 90,684.50

Step by Step Solution

1. Step 1: Write the proportion equation
   312,300.50 : 468,463.71 = 90,684.50 : x
2. Step 2: Convert to fraction form
   312,300.50/468,463.71 = 90,684.50/x
3. Step 3: Cross multiply
   312,300.50x = 468,463.71 × 90,684.50
4. Step 4: Simplify right side
   312,300.50x = 42,482,397,309.50
5. Step 5: Solve for x
   x = 42,482,397,309.50/312,300.50
6. Step 6: Final answer
   x = 136,030.51