Finding the Fourth Proportional to 99,345.10, 148,689.60 and 69,820.60

Step by Step Solution

1. Step 1: Write the proportion equation
   99,345.10 : 148,689.60 = 69,820.60 : x
2. Step 2: Convert to fraction form
   99,345.10/148,689.60 = 69,820.60/x
3. Step 3: Cross multiply
   99,345.10x = 148,689.60 × 69,820.60
4. Step 4: Simplify right side
   99,345.10x = 10,381,597,085.76
5. Step 5: Solve for x
   x = 10,381,597,085.76/99,345.10
6. Step 6: Final answer
   x = 104,500.34