Finding the Fourth Proportional to 353,978.10, 531,581.55 and 188,090.10

Step by Step Solution

1. Step 1: Write the proportion equation
   353,978.10 : 531,581.55 = 188,090.10 : x
2. Step 2: Convert to fraction form
   353,978.10/531,581.55 = 188,090.10/x
3. Step 3: Cross multiply
   353,978.10x = 531,581.55 × 188,090.10
4. Step 4: Simplify right side
   353,978.10x = 99,985,226,897.66
5. Step 5: Solve for x
   x = 99,985,226,897.66/353,978.10
6. Step 6: Final answer
   x = 282,461.62