Finding the Fourth Proportional to 128,590.61, 177,457.89 and 73,398.81

Step by Step Solution

1. Step 1: Write the proportion equation
   128,590.61 : 177,457.89 = 73,398.81 : x
2. Step 2: Convert to fraction form
   128,590.61/177,457.89 = 73,398.81/x
3. Step 3: Cross multiply
   128,590.61x = 177,457.89 × 73,398.81
4. Step 4: Simplify right side
   128,590.61x = 13,025,198,891.82
5. Step 5: Solve for x
   x = 13,025,198,891.82/128,590.61
6. Step 6: Final answer
   x = 101,291.99