Finding the Fourth Proportional to 139,017.72, 208,541.16 and 45,530.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,017.72 : 208,541.16 = 45,530.76 : x
2. Step 2: Convert to fraction form
   139,017.72/208,541.16 = 45,530.76/x
3. Step 3: Cross multiply
   139,017.72x = 208,541.16 × 45,530.76
4. Step 4: Simplify right side
   139,017.72x = 9,495,037,506.08
5. Step 5: Solve for x
   x = 9,495,037,506.08/139,017.72
6. Step 6: Final answer
   x = 68,300.92