Finding the Fourth Proportional to 76,200, 105,156 and 42,666.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,200 : 105,156 = 42,666.72 : x
2. Step 2: Convert to fraction form
   76,200/105,156 = 42,666.72/x
3. Step 3: Cross multiply
   76,200x = 105,156 × 42,666.72
4. Step 4: Simplify right side
   76,200x = 4,486,661,608.32
5. Step 5: Solve for x
   x = 4,486,661,608.32/76,200
6. Step 6: Final answer
   x = 58,880.07