Finding the Fourth Proportional to 76,111.31, 105,031.45 and 42,121.21

Step by Step Solution

1. Step 1: Write the proportion equation
   76,111.31 : 105,031.45 = 42,121.21 : x
2. Step 2: Convert to fraction form
   76,111.31/105,031.45 = 42,121.21/x
3. Step 3: Cross multiply
   76,111.31x = 105,031.45 × 42,121.21
4. Step 4: Simplify right side
   76,111.31x = 4,424,051,762.05
5. Step 5: Solve for x
   x = 4,424,051,762.05/76,111.31
6. Step 6: Final answer
   x = 58,126.08