Finding the Fourth Proportional to 90,561.51, 125,019.86 and 56,588.83

Step by Step Solution

1. Step 1: Write the proportion equation
   90,561.51 : 125,019.86 = 56,588.83 : x
2. Step 2: Convert to fraction form
   90,561.51/125,019.86 = 56,588.83/x
3. Step 3: Cross multiply
   90,561.51x = 125,019.86 × 56,588.83
4. Step 4: Simplify right side
   90,561.51x = 7,074,727,008.67
5. Step 5: Solve for x
   x = 7,074,727,008.67/90,561.51
6. Step 6: Final answer
   x = 78,120.68