Finding the Fourth Proportional to 99,300.42, 148,911.35 and 78,280.92

Step by Step Solution

1. Step 1: Write the proportion equation
   99,300.42 : 148,911.35 = 78,280.92 : x
2. Step 2: Convert to fraction form
   99,300.42/148,911.35 = 78,280.92/x
3. Step 3: Cross multiply
   99,300.42x = 148,911.35 × 78,280.92
4. Step 4: Simplify right side
   99,300.42x = 11,656,917,085.04
5. Step 5: Solve for x
   x = 11,656,917,085.04/99,300.42
6. Step 6: Final answer
   x = 117,390.41