Finding the Fourth Proportional to 172,117.81, 257,624.20 and 91,955.45

Step by Step Solution

1. Step 1: Write the proportion equation
   172,117.81 : 257,624.20 = 91,955.45 : x
2. Step 2: Convert to fraction form
   172,117.81/257,624.20 = 91,955.45/x
3. Step 3: Cross multiply
   172,117.81x = 257,624.20 × 91,955.45
4. Step 4: Simplify right side
   172,117.81x = 23,689,949,483.65
5. Step 5: Solve for x
   x = 23,689,949,483.65/172,117.81
6. Step 6: Final answer
   x = 137,637.99