Finding the Fourth Proportional to 139,576.53, 209,450.90 and 64,682.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,576.53 : 209,450.90 = 64,682.72 : x
2. Step 2: Convert to fraction form
   139,576.53/209,450.90 = 64,682.72/x
3. Step 3: Cross multiply
   139,576.53x = 209,450.90 × 64,682.72
4. Step 4: Simplify right side
   139,576.53x = 13,547,853,818.34
5. Step 5: Solve for x
   x = 13,547,853,818.34/139,576.53
6. Step 6: Final answer
   x = 97,063.98