Finding the Fourth Proportional to 76,438.81, 105,482.01 and 42,449.45

Step by Step Solution

1. Step 1: Write the proportion equation
   76,438.81 : 105,482.01 = 42,449.45 : x
2. Step 2: Convert to fraction form
   76,438.81/105,482.01 = 42,449.45/x
3. Step 3: Cross multiply
   76,438.81x = 105,482.01 × 42,449.45
4. Step 4: Simplify right side
   76,438.81x = 4,477,653,573.10
5. Step 5: Solve for x
   x = 4,477,653,573.10/76,438.81
6. Step 6: Final answer
   x = 58,578.28