Finding the Fourth Proportional to 139,904.34, 209,897.46 and 45,132.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,904.34 : 209,897.46 = 45,132.72 : x
2. Step 2: Convert to fraction form
   139,904.34/209,897.46 = 45,132.72/x
3. Step 3: Cross multiply
   139,904.34x = 209,897.46 × 45,132.72
4. Step 4: Simplify right side
   139,904.34x = 9,473,243,290.89
5. Step 5: Solve for x
   x = 9,473,243,290.89/139,904.34
6. Step 6: Final answer
   x = 67,712.29