Finding the Fourth Proportional to 312,772.50, 469,245.15 and 91,156.50

Step by Step Solution

1. Step 1: Write the proportion equation
   312,772.50 : 469,245.15 = 91,156.50 : x
2. Step 2: Convert to fraction form
   312,772.50/469,245.15 = 91,156.50/x
3. Step 3: Cross multiply
   312,772.50x = 469,245.15 × 91,156.50
4. Step 4: Simplify right side
   312,772.50x = 42,774,745,515.98
5. Step 5: Solve for x
   x = 42,774,745,515.98/312,772.50
6. Step 6: Final answer
   x = 136,759.93