Finding the Fourth Proportional to 76,436, 105,482.40 and 42,902.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,436 : 105,482.40 = 42,902.72 : x
2. Step 2: Convert to fraction form
   76,436/105,482.40 = 42,902.72/x
3. Step 3: Cross multiply
   76,436x = 105,482.40 × 42,902.72
4. Step 4: Simplify right side
   76,436x = 4,525,481,872.13
5. Step 5: Solve for x
   x = 4,525,481,872.13/76,436
6. Step 6: Final answer
   x = 59,206.16