Finding the Fourth Proportional to 111,120.04, 166,068.48 and 81,196.57

Step by Step Solution

1. Step 1: Write the proportion equation
   111,120.04 : 166,068.48 = 81,196.57 : x
2. Step 2: Convert to fraction form
   111,120.04/166,068.48 = 81,196.57/x
3. Step 3: Cross multiply
   111,120.04x = 166,068.48 × 81,196.57
4. Step 4: Simplify right side
   111,120.04x = 13,484,190,961.11
5. Step 5: Solve for x
   x = 13,484,190,961.11/111,120.04
6. Step 6: Final answer
   x = 121,347.97