Finding the Fourth Proportional to 312,300, 468,462.96 and 90,684

Step by Step Solution

1. Step 1: Write the proportion equation
   312,300 : 468,462.96 = 90,684 : x
2. Step 2: Convert to fraction form
   312,300/468,462.96 = 90,684/x
3. Step 3: Cross multiply
   312,300x = 468,462.96 × 90,684
4. Step 4: Simplify right side
   312,300x = 42,482,095,064.64
5. Step 5: Solve for x
   x = 42,482,095,064.64/312,300
6. Step 6: Final answer
   x = 136,029.76