Finding the Fourth Proportional to 73,956.88, 102,071.12 and 42,128.80

Step by Step Solution

1. Step 1: Write the proportion equation
   73,956.88 : 102,071.12 = 42,128.80 : x
2. Step 2: Convert to fraction form
   73,956.88/102,071.12 = 42,128.80/x
3. Step 3: Cross multiply
   73,956.88x = 102,071.12 × 42,128.80
4. Step 4: Simplify right side
   73,956.88x = 4,300,133,800.26
5. Step 5: Solve for x
   x = 4,300,133,800.26/73,956.88
6. Step 6: Final answer
   x = 58,143.80