Finding the Fourth Proportional to 102,991, 142,111.14 and 57,670.96

Step by Step Solution

1. Step 1: Write the proportion equation
   102,991 : 142,111.14 = 57,670.96 : x
2. Step 2: Convert to fraction form
   102,991/142,111.14 = 57,670.96/x
3. Step 3: Cross multiply
   102,991x = 142,111.14 × 57,670.96
4. Step 4: Simplify right side
   102,991x = 8,195,685,870.49
5. Step 5: Solve for x
   x = 8,195,685,870.49/102,991
6. Step 6: Final answer
   x = 79,576.72