Finding the Fourth Proportional to 101,439.72, 139,980.69 and 61,166.52

Step by Step Solution

1. Step 1: Write the proportion equation
   101,439.72 : 139,980.69 = 61,166.52 : x
2. Step 2: Convert to fraction form
   101,439.72/139,980.69 = 61,166.52/x
3. Step 3: Cross multiply
   101,439.72x = 139,980.69 × 61,166.52
4. Step 4: Simplify right side
   101,439.72x = 8,562,131,674.50
5. Step 5: Solve for x
   x = 8,562,131,674.50/101,439.72
6. Step 6: Final answer
   x = 84,406.11