Finding the Fourth Proportional to 222,958.78, 334,437.98 and 128,128.48

Step by Step Solution

1. Step 1: Write the proportion equation
   222,958.78 : 334,437.98 = 128,128.48 : x
2. Step 2: Convert to fraction form
   222,958.78/334,437.98 = 128,128.48/x
3. Step 3: Cross multiply
   222,958.78x = 334,437.98 × 128,128.48
4. Step 4: Simplify right side
   222,958.78x = 42,851,030,031.67
5. Step 5: Solve for x
   x = 42,851,030,031.67/222,958.78
6. Step 6: Final answer
   x = 192,192.61