Finding the Fourth Proportional to 76,111.81, 105,031.70 and 42,121.73

Step by Step Solution

1. Step 1: Write the proportion equation
   76,111.81 : 105,031.70 = 42,121.73 : x
2. Step 2: Convert to fraction form
   76,111.81/105,031.70 = 42,121.73/x
3. Step 3: Cross multiply
   76,111.81x = 105,031.70 × 42,121.73
4. Step 4: Simplify right side
   76,111.81x = 4,424,116,908.84
5. Step 5: Solve for x
   x = 4,424,116,908.84/76,111.81
6. Step 6: Final answer
   x = 58,126.55