Finding the Fourth Proportional to 213,127.68, 319,688.72 and 61,328.72

Step by Step Solution

1. Step 1: Write the proportion equation
   213,127.68 : 319,688.72 = 61,328.72 : x
2. Step 2: Convert to fraction form
   213,127.68/319,688.72 = 61,328.72/x
3. Step 3: Cross multiply
   213,127.68x = 319,688.72 × 61,328.72
4. Step 4: Simplify right side
   213,127.68x = 19,606,099,996.04
5. Step 5: Solve for x
   x = 19,606,099,996.04/213,127.68
6. Step 6: Final answer
   x = 91,992.27