Finding the Fourth Proportional to 223,484.59, 308,419.82 and 138,628.99

Step by Step Solution

1. Step 1: Write the proportion equation
   223,484.59 : 308,419.82 = 138,628.99 : x
2. Step 2: Convert to fraction form
   223,484.59/308,419.82 = 138,628.99/x
3. Step 3: Cross multiply
   223,484.59x = 308,419.82 × 138,628.99
4. Step 4: Simplify right side
   223,484.59x = 42,755,928,142.58
5. Step 5: Solve for x
   x = 42,755,928,142.58/223,484.59
6. Step 6: Final answer
   x = 191,314.88