Finding the Fourth Proportional to 312,445.50, 468,748.17 and 90,829.50

Step by Step Solution

1. Step 1: Write the proportion equation
   312,445.50 : 468,748.17 = 90,829.50 : x
2. Step 2: Convert to fraction form
   312,445.50/468,748.17 = 90,829.50/x
3. Step 3: Cross multiply
   312,445.50x = 468,748.17 × 90,829.50
4. Step 4: Simplify right side
   312,445.50x = 42,576,161,907.02
5. Step 5: Solve for x
   x = 42,576,161,907.02/312,445.50
6. Step 6: Final answer
   x = 136,267.48