Finding the Fourth Proportional to 103,779.60, 155,667.80 and 70,416.72

Step by Step Solution

1. Step 1: Write the proportion equation
   103,779.60 : 155,667.80 = 70,416.72 : x
2. Step 2: Convert to fraction form
   103,779.60/155,667.80 = 70,416.72/x
3. Step 3: Cross multiply
   103,779.60x = 155,667.80 × 70,416.72
4. Step 4: Simplify right side
   103,779.60x = 10,961,615,885.62
5. Step 5: Solve for x
   x = 10,961,615,885.62/103,779.60
6. Step 6: Final answer
   x = 105,623.99