Finding the Fourth Proportional to 127,638.39, 191,457.63 and 57,435.69

Step by Step Solution

1. Step 1: Write the proportion equation
   127,638.39 : 191,457.63 = 57,435.69 : x
2. Step 2: Convert to fraction form
   127,638.39/191,457.63 = 57,435.69/x
3. Step 3: Cross multiply
   127,638.39x = 191,457.63 × 57,435.69
4. Step 4: Simplify right side
   127,638.39x = 10,996,501,084.81
5. Step 5: Solve for x
   x = 10,996,501,084.81/127,638.39
6. Step 6: Final answer
   x = 86,153.56