Finding the Fourth Proportional to 139,503.12, 209,225.52 and 45,987.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,503.12 : 209,225.52 = 45,987.12 : x
2. Step 2: Convert to fraction form
   139,503.12/209,225.52 = 45,987.12/x
3. Step 3: Cross multiply
   139,503.12x = 209,225.52 × 45,987.12
4. Step 4: Simplify right side
   139,503.12x = 9,621,679,095.30
5. Step 5: Solve for x
   x = 9,621,679,095.30/139,503.12
6. Step 6: Final answer
   x = 68,971.07