Finding the Fourth Proportional to 111,429, 153,774.45 and 61,128

Step by Step Solution

1. Step 1: Write the proportion equation
   111,429 : 153,774.45 = 61,128 : x
2. Step 2: Convert to fraction form
   111,429/153,774.45 = 61,128/x
3. Step 3: Cross multiply
   111,429x = 153,774.45 × 61,128
4. Step 4: Simplify right side
   111,429x = 9,399,924,579.60
5. Step 5: Solve for x
   x = 9,399,924,579.60/111,429
6. Step 6: Final answer
   x = 84,357.97