Finding the Fourth Proportional to 76,152.72, 105,146.20 and 61,128.03

Step by Step Solution

1. Step 1: Write the proportion equation
   76,152.72 : 105,146.20 = 61,128.03 : x
2. Step 2: Convert to fraction form
   76,152.72/105,146.20 = 61,128.03/x
3. Step 3: Cross multiply
   76,152.72x = 105,146.20 × 61,128.03
4. Step 4: Simplify right side
   76,152.72x = 6,427,379,762.35
5. Step 5: Solve for x
   x = 6,427,379,762.35/76,152.72
6. Step 6: Final answer
   x = 84,401.18