Finding the Fourth Proportional to 76,412.21, 105,443.55 and 42,418.01

Step by Step Solution

1. Step 1: Write the proportion equation
   76,412.21 : 105,443.55 = 42,418.01 : x
2. Step 2: Convert to fraction form
   76,412.21/105,443.55 = 42,418.01/x
3. Step 3: Cross multiply
   76,412.21x = 105,443.55 × 42,418.01
4. Step 4: Simplify right side
   76,412.21x = 4,472,705,031.12
5. Step 5: Solve for x
   x = 4,472,705,031.12/76,412.21
6. Step 6: Final answer
   x = 58,533.91