Finding the Fourth Proportional to 31,116, 42,926.44 and 19,779.40

Step by Step Solution

1. Step 1: Write the proportion equation
   31,116 : 42,926.44 = 19,779.40 : x
2. Step 2: Convert to fraction form
   31,116/42,926.44 = 19,779.40/x
3. Step 3: Cross multiply
   31,116x = 42,926.44 × 19,779.40
4. Step 4: Simplify right side
   31,116x = 849,059,227.34
5. Step 5: Solve for x
   x = 849,059,227.34/31,116
6. Step 6: Final answer
   x = 27,286.90