Finding the Fourth Proportional to 76,121.13, 105,047.34 and 42,131.94

Step by Step Solution

1. Step 1: Write the proportion equation
   76,121.13 : 105,047.34 = 42,131.94 : x
2. Step 2: Convert to fraction form
   76,121.13/105,047.34 = 42,131.94/x
3. Step 3: Cross multiply
   76,121.13x = 105,047.34 × 42,131.94
4. Step 4: Simplify right side
   76,121.13x = 4,425,848,226.04
5. Step 5: Solve for x
   x = 4,425,848,226.04/76,121.13
6. Step 6: Final answer
   x = 58,142.18