Finding the Fourth Proportional to 73,982.42, 102,070.74 and 42,128.76

Step by Step Solution

1. Step 1: Write the proportion equation
   73,982.42 : 102,070.74 = 42,128.76 : x
2. Step 2: Convert to fraction form
   73,982.42/102,070.74 = 42,128.76/x
3. Step 3: Cross multiply
   73,982.42x = 102,070.74 × 42,128.76
4. Step 4: Simplify right side
   73,982.42x = 4,300,113,708.48
5. Step 5: Solve for x
   x = 4,300,113,708.48/73,982.42
6. Step 6: Final answer
   x = 58,123.45