Finding the Fourth Proportional to 111,011.55, 153,009.37 and 84,145.47

Step by Step Solution

1. Step 1: Write the proportion equation
   111,011.55 : 153,009.37 = 84,145.47 : x
2. Step 2: Convert to fraction form
   111,011.55/153,009.37 = 84,145.47/x
3. Step 3: Cross multiply
   111,011.55x = 153,009.37 × 84,145.47
4. Step 4: Simplify right side
   111,011.55x = 12,875,045,353.05
5. Step 5: Solve for x
   x = 12,875,045,353.05/111,011.55
6. Step 6: Final answer
   x = 115,979.33